1 /* Rewritten and vastly simplified by Rusty Russell for in-kernel 2 * module loader: 3 * Copyright 2002 Rusty Russell <[email protected]> IBM Corporation 4 */ 5 #ifndef _LINUX_KALLSYMS_H 6 #define _LINUX_KALLSYMS_H 7 8 #include <linux/errno.h> 9 #include <linux/kernel.h> 10 #include <linux/stddef.h> 11 12 #define KSYM_NAME_LEN 128 13 #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \ 14 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1) 15 16 struct module; 17 18 #ifdef CONFIG_KALLSYMS 19 /* Lookup the address for a symbol. Returns 0 if not found. */ 20 unsigned long kallsyms_lookup_name(const char *name); 21 22 /* Call a function on each kallsyms symbol in the core kernel */ 23 int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, 24 unsigned long), 25 void *data); 26 27 extern int kallsyms_lookup_size_offset(unsigned long addr, 28 unsigned long *symbolsize, 29 unsigned long *offset); 30 31 /* Lookup an address. modname is set to NULL if it's in the kernel. */ 32 const char *kallsyms_lookup(unsigned long addr, 33 unsigned long *symbolsize, 34 unsigned long *offset, 35 char **modname, char *namebuf); 36 37 /* Look up a kernel symbol and return it in a text buffer. */ 38 extern int sprint_symbol(char *buffer, unsigned long address); 39 40 /* Look up a kernel symbol and print it to the kernel messages. */ 41 extern void __print_symbol(const char *fmt, unsigned long address); 42 43 int lookup_symbol_name(unsigned long addr, char *symname); 44 int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name); 45 46 #else /* !CONFIG_KALLSYMS */ 47 48 static inline unsigned long kallsyms_lookup_name(const char *name) 49 { 50 return 0; 51 } 52 53 static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, 54 struct module *, 55 unsigned long), 56 void *data) 57 { 58 return 0; 59 } 60 61 static inline int kallsyms_lookup_size_offset(unsigned long addr, 62 unsigned long *symbolsize, 63 unsigned long *offset) 64 { 65 return 0; 66 } 67 68 static inline const char *kallsyms_lookup(unsigned long addr, 69 unsigned long *symbolsize, 70 unsigned long *offset, 71 char **modname, char *namebuf) 72 { 73 return NULL; 74 } 75 76 static inline int sprint_symbol(char *buffer, unsigned long addr) 77 { 78 *buffer = '\0'; 79 return 0; 80 } 81 82 static inline int lookup_symbol_name(unsigned long addr, char *symname) 83 { 84 return -ERANGE; 85 } 86 87 static inline int lookup_symbol_attrs(unsigned long addr, unsigned long *size, unsigned long *offset, char *modname, char *name) 88 { 89 return -ERANGE; 90 } 91 92 /* Stupid that this does nothing, but I didn't create this mess. */ 93 #define __print_symbol(fmt, addr) 94 #endif /*CONFIG_KALLSYMS*/ 95 96 /* This macro allows us to keep printk typechecking */ 97 static void __check_printsym_format(const char *fmt, ...) 98 __attribute__((format(printf,1,2))); 99 static inline void __check_printsym_format(const char *fmt, ...) 100 { 101 } 102 103 static inline void print_symbol(const char *fmt, unsigned long addr) 104 { 105 __check_printsym_format(fmt, ""); 106 __print_symbol(fmt, (unsigned long) 107 __builtin_extract_return_addr((void *)addr)); 108 } 109 110 /* 111 * Pretty-print a function pointer. This function is deprecated. 112 * Please use the "%pF" vsprintf format instead. 113 */ 114 static inline void __deprecated print_fn_descriptor_symbol(const char *fmt, void *addr) 115 { 116 #if defined(CONFIG_IA64) || defined(CONFIG_PPC64) 117 addr = *(void **)addr; 118 #endif 119 print_symbol(fmt, (unsigned long)addr); 120 } 121 122 static inline void print_ip_sym(unsigned long ip) 123 { 124 printk("[<%p>] %pS\n", (void *) ip, (void *) ip); 125 } 126 127 #endif /*_LINUX_KALLSYMS_H*/ 128